<!DOCTYPE html>
<html lang="en-US">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title>编写基础请求代码 | Keith&#39;s blog</title>
    <meta name="generator" content="VuePress 1.8.0">
    <link rel="icon" href="/img/favicon.png">
    <script data-ad-client="ca-pub-7828333725993554" async="async" src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
    <meta name="description" content="web前端技术博客,简洁至上,专注web前端学习与总结。JavaScript,js,ES6,TypeScript,vue,python,css3,html5,Node,git,github等技术文章。">
    <meta name="keywords" content="前端博客,个人技术博客,前端,前端开发,前端框架,web前端,前端面试题,技术文档,学习,面试,JavaScript,js,ES6,TypeScript,vue,python,css3,html5,Node,git,github,markdown">
    <meta name="baidu-site-verification" content="7F55weZDDc">
    <meta name="theme-color" content="#11a8cd">
    <link rel="preload" href="/assets/css/0.styles.95a28cfa.css" as="style"><link rel="preload" href="/assets/js/app.ae5bf724.js" as="script"><link rel="preload" href="/assets/js/2.72b09a26.js" as="script"><link rel="preload" href="/assets/js/3.96877024.js" as="script"><link rel="preload" href="/assets/js/170.d93daf1f.js" as="script"><link rel="prefetch" href="/assets/js/10.3e431465.js"><link rel="prefetch" href="/assets/js/100.c7b84f24.js"><link rel="prefetch" href="/assets/js/101.e5a7e6f5.js"><link rel="prefetch" href="/assets/js/102.85992487.js"><link rel="prefetch" href="/assets/js/103.3f187c57.js"><link rel="prefetch" href="/assets/js/104.103d7471.js"><link rel="prefetch" href="/assets/js/105.df0063c0.js"><link rel="prefetch" href="/assets/js/106.d3f285ee.js"><link rel="prefetch" href="/assets/js/107.7ca5e73a.js"><link rel="prefetch" href="/assets/js/108.b5e1495a.js"><link rel="prefetch" href="/assets/js/109.12b39840.js"><link rel="prefetch" href="/assets/js/11.c0c2ac1e.js"><link rel="prefetch" href="/assets/js/110.2996b4eb.js"><link rel="prefetch" href="/assets/js/111.752c7e87.js"><link rel="prefetch" href="/assets/js/112.7c01a356.js"><link rel="prefetch" href="/assets/js/113.240fbeb5.js"><link rel="prefetch" href="/assets/js/114.502fae11.js"><link rel="prefetch" href="/assets/js/115.28ee11f8.js"><link rel="prefetch" href="/assets/js/116.a3f220c8.js"><link rel="prefetch" href="/assets/js/117.293dbd7c.js"><link rel="prefetch" href="/assets/js/118.7fe06c79.js"><link rel="prefetch" href="/assets/js/119.eb539041.js"><link rel="prefetch" href="/assets/js/12.0ea0beb2.js"><link rel="prefetch" href="/assets/js/120.8502bd78.js"><link rel="prefetch" href="/assets/js/121.696d358f.js"><link rel="prefetch" href="/assets/js/122.a629ef96.js"><link rel="prefetch" href="/assets/js/123.bc97cb45.js"><link rel="prefetch" href="/assets/js/124.e9dbc4a1.js"><link rel="prefetch" href="/assets/js/125.3372248a.js"><link rel="prefetch" href="/assets/js/126.58bf8057.js"><link rel="prefetch" href="/assets/js/127.532c80ac.js"><link rel="prefetch" href="/assets/js/128.a8a9dd63.js"><link rel="prefetch" href="/assets/js/129.952e36b7.js"><link rel="prefetch" href="/assets/js/13.81b38e3a.js"><link rel="prefetch" href="/assets/js/130.3f453493.js"><link rel="prefetch" href="/assets/js/131.15bb01bf.js"><link rel="prefetch" href="/assets/js/132.5e501da7.js"><link rel="prefetch" href="/assets/js/133.fbd296a8.js"><link rel="prefetch" href="/assets/js/134.a455c276.js"><link rel="prefetch" href="/assets/js/135.50985645.js"><link rel="prefetch" href="/assets/js/136.dd156bdc.js"><link rel="prefetch" href="/assets/js/137.91d77519.js"><link rel="prefetch" href="/assets/js/138.af96bbc9.js"><link rel="prefetch" href="/assets/js/139.ff60e390.js"><link rel="prefetch" href="/assets/js/14.13ff5f93.js"><link rel="prefetch" href="/assets/js/140.51ef13cd.js"><link rel="prefetch" href="/assets/js/141.2c36f0bb.js"><link rel="prefetch" href="/assets/js/142.745a5a9d.js"><link rel="prefetch" href="/assets/js/143.ef12ce5a.js"><link rel="prefetch" href="/assets/js/144.d53b8a10.js"><link rel="prefetch" href="/assets/js/145.01c80734.js"><link rel="prefetch" href="/assets/js/146.ff1abf8c.js"><link rel="prefetch" href="/assets/js/147.b334a956.js"><link rel="prefetch" href="/assets/js/148.82d1c504.js"><link rel="prefetch" href="/assets/js/149.4872ca41.js"><link rel="prefetch" href="/assets/js/15.ba6da9d5.js"><link rel="prefetch" href="/assets/js/150.eaa1b09e.js"><link rel="prefetch" href="/assets/js/151.b9deeab6.js"><link rel="prefetch" href="/assets/js/152.8914ff06.js"><link rel="prefetch" href="/assets/js/153.1c968910.js"><link rel="prefetch" href="/assets/js/154.ac2ac8e9.js"><link rel="prefetch" href="/assets/js/155.a41ac4d1.js"><link rel="prefetch" href="/assets/js/156.07ec7daa.js"><link rel="prefetch" href="/assets/js/157.d0cfaeb2.js"><link rel="prefetch" href="/assets/js/158.4a3844de.js"><link rel="prefetch" href="/assets/js/159.cd2739bf.js"><link rel="prefetch" href="/assets/js/16.bd936cd0.js"><link rel="prefetch" href="/assets/js/160.8ea34b7b.js"><link rel="prefetch" href="/assets/js/161.4bb2ece8.js"><link rel="prefetch" href="/assets/js/162.a4b2690b.js"><link rel="prefetch" href="/assets/js/163.85acbc57.js"><link rel="prefetch" href="/assets/js/164.acce92e2.js"><link rel="prefetch" href="/assets/js/165.08b51ce6.js"><link rel="prefetch" href="/assets/js/166.7ad057e5.js"><link rel="prefetch" href="/assets/js/167.2d35a768.js"><link rel="prefetch" href="/assets/js/168.b7790709.js"><link rel="prefetch" href="/assets/js/169.11b5000c.js"><link rel="prefetch" href="/assets/js/17.1d7263eb.js"><link rel="prefetch" href="/assets/js/171.14a45c02.js"><link rel="prefetch" href="/assets/js/172.c62eb70d.js"><link rel="prefetch" href="/assets/js/173.9dd4cb5e.js"><link rel="prefetch" href="/assets/js/174.deca226f.js"><link rel="prefetch" href="/assets/js/175.eef20df3.js"><link rel="prefetch" href="/assets/js/176.c09f5a25.js"><link rel="prefetch" href="/assets/js/177.99e3a6a8.js"><link rel="prefetch" href="/assets/js/178.22bd595d.js"><link rel="prefetch" href="/assets/js/179.ef63471d.js"><link rel="prefetch" href="/assets/js/18.9412ae71.js"><link rel="prefetch" href="/assets/js/180.306daca4.js"><link rel="prefetch" href="/assets/js/181.9f8eae15.js"><link rel="prefetch" href="/assets/js/182.36cd1ffa.js"><link rel="prefetch" href="/assets/js/183.0195ae23.js"><link rel="prefetch" href="/assets/js/184.61363002.js"><link rel="prefetch" href="/assets/js/185.d01ed7e5.js"><link rel="prefetch" href="/assets/js/186.915e1946.js"><link rel="prefetch" href="/assets/js/187.392993c9.js"><link rel="prefetch" href="/assets/js/188.afcb3c55.js"><link rel="prefetch" href="/assets/js/189.99313768.js"><link rel="prefetch" href="/assets/js/19.17a0f886.js"><link rel="prefetch" href="/assets/js/190.3740a1c8.js"><link rel="prefetch" href="/assets/js/191.a8cebbb8.js"><link rel="prefetch" href="/assets/js/192.a4e4b0eb.js"><link rel="prefetch" href="/assets/js/193.f87069af.js"><link rel="prefetch" href="/assets/js/194.a83aa1ad.js"><link rel="prefetch" href="/assets/js/195.6cccc323.js"><link rel="prefetch" href="/assets/js/196.0ca74fc2.js"><link rel="prefetch" href="/assets/js/197.e57085c4.js"><link rel="prefetch" href="/assets/js/198.9d8c4195.js"><link rel="prefetch" href="/assets/js/199.e34f6d16.js"><link rel="prefetch" href="/assets/js/20.751f715d.js"><link rel="prefetch" href="/assets/js/200.4f0c1baf.js"><link rel="prefetch" href="/assets/js/201.92b5153f.js"><link rel="prefetch" href="/assets/js/202.9f5b1117.js"><link rel="prefetch" href="/assets/js/203.84c5aa3f.js"><link rel="prefetch" href="/assets/js/204.950ec43f.js"><link rel="prefetch" href="/assets/js/205.3caa1fd5.js"><link rel="prefetch" href="/assets/js/206.c5d73eeb.js"><link rel="prefetch" href="/assets/js/207.f00a7726.js"><link rel="prefetch" href="/assets/js/208.49394867.js"><link rel="prefetch" href="/assets/js/209.f891c646.js"><link rel="prefetch" href="/assets/js/21.7e3b1dd6.js"><link rel="prefetch" href="/assets/js/210.9b3ce6fe.js"><link rel="prefetch" href="/assets/js/211.22cbc362.js"><link rel="prefetch" href="/assets/js/212.5380a60a.js"><link rel="prefetch" href="/assets/js/213.64691857.js"><link rel="prefetch" href="/assets/js/214.bf089249.js"><link rel="prefetch" href="/assets/js/215.285eccf0.js"><link rel="prefetch" href="/assets/js/216.e135c2e1.js"><link rel="prefetch" href="/assets/js/217.202ec57b.js"><link rel="prefetch" href="/assets/js/218.c1b5175f.js"><link rel="prefetch" href="/assets/js/219.ac0461eb.js"><link rel="prefetch" href="/assets/js/22.67350c09.js"><link rel="prefetch" href="/assets/js/220.944daf1d.js"><link rel="prefetch" href="/assets/js/221.73cba4fb.js"><link rel="prefetch" href="/assets/js/222.cd29efdd.js"><link rel="prefetch" href="/assets/js/223.5c40831a.js"><link rel="prefetch" href="/assets/js/224.0a05890e.js"><link rel="prefetch" href="/assets/js/225.7c20df0a.js"><link rel="prefetch" href="/assets/js/226.c7f69539.js"><link rel="prefetch" href="/assets/js/227.9ccb8852.js"><link rel="prefetch" href="/assets/js/228.77bd4f2e.js"><link rel="prefetch" href="/assets/js/229.1c656481.js"><link rel="prefetch" href="/assets/js/23.308ebe55.js"><link rel="prefetch" href="/assets/js/230.a3adae2f.js"><link rel="prefetch" href="/assets/js/231.f40d7e85.js"><link rel="prefetch" href="/assets/js/232.762cdd7e.js"><link rel="prefetch" href="/assets/js/233.29242686.js"><link rel="prefetch" href="/assets/js/24.2bb08ee4.js"><link rel="prefetch" href="/assets/js/25.3f1e32c9.js"><link rel="prefetch" href="/assets/js/26.6d06f7bc.js"><link rel="prefetch" href="/assets/js/27.edfd52de.js"><link rel="prefetch" href="/assets/js/28.8c959146.js"><link rel="prefetch" href="/assets/js/29.1621b6ed.js"><link rel="prefetch" href="/assets/js/30.751b1f17.js"><link rel="prefetch" href="/assets/js/31.ec665a74.js"><link rel="prefetch" href="/assets/js/32.1b1d72d5.js"><link rel="prefetch" href="/assets/js/33.b5bd40a4.js"><link rel="prefetch" href="/assets/js/34.2155b0a7.js"><link rel="prefetch" href="/assets/js/35.d59b534a.js"><link rel="prefetch" href="/assets/js/36.44a9c35e.js"><link rel="prefetch" href="/assets/js/37.fd11aa80.js"><link rel="prefetch" href="/assets/js/38.a788fd7b.js"><link rel="prefetch" href="/assets/js/39.0099a8f6.js"><link rel="prefetch" href="/assets/js/4.ff489266.js"><link rel="prefetch" href="/assets/js/40.40c37c27.js"><link rel="prefetch" href="/assets/js/41.a1008003.js"><link rel="prefetch" href="/assets/js/42.5b767b44.js"><link rel="prefetch" href="/assets/js/43.3f71078e.js"><link rel="prefetch" href="/assets/js/44.ad24f6c3.js"><link rel="prefetch" href="/assets/js/45.25e40b16.js"><link rel="prefetch" href="/assets/js/46.b64da983.js"><link rel="prefetch" href="/assets/js/47.17f22f05.js"><link rel="prefetch" href="/assets/js/48.98ac4a14.js"><link rel="prefetch" href="/assets/js/49.2d4cfb58.js"><link rel="prefetch" href="/assets/js/5.90f8b8b3.js"><link rel="prefetch" href="/assets/js/50.961c11a7.js"><link rel="prefetch" href="/assets/js/51.c69cd332.js"><link rel="prefetch" href="/assets/js/52.63e40184.js"><link rel="prefetch" href="/assets/js/53.ed393af3.js"><link rel="prefetch" href="/assets/js/54.e8bf699e.js"><link rel="prefetch" href="/assets/js/55.8c4b1f29.js"><link rel="prefetch" href="/assets/js/56.3ea6fad9.js"><link rel="prefetch" href="/assets/js/57.e355b934.js"><link rel="prefetch" href="/assets/js/58.591ee455.js"><link rel="prefetch" href="/assets/js/59.f75a544d.js"><link rel="prefetch" href="/assets/js/6.01e8382f.js"><link rel="prefetch" href="/assets/js/60.941e9812.js"><link rel="prefetch" href="/assets/js/61.4f56972b.js"><link rel="prefetch" href="/assets/js/62.bd0a67cc.js"><link rel="prefetch" href="/assets/js/63.5525dd5a.js"><link rel="prefetch" href="/assets/js/64.2e40b93d.js"><link rel="prefetch" href="/assets/js/65.7d7a1250.js"><link rel="prefetch" href="/assets/js/66.e88829f6.js"><link rel="prefetch" href="/assets/js/67.233ad823.js"><link rel="prefetch" href="/assets/js/68.037f0252.js"><link rel="prefetch" href="/assets/js/69.d5c49911.js"><link rel="prefetch" href="/assets/js/7.67b2aba3.js"><link rel="prefetch" href="/assets/js/70.039de8ef.js"><link rel="prefetch" href="/assets/js/71.fbbf266f.js"><link rel="prefetch" href="/assets/js/72.2cbdccb2.js"><link rel="prefetch" href="/assets/js/73.f824da30.js"><link rel="prefetch" href="/assets/js/74.c8e2bd49.js"><link rel="prefetch" href="/assets/js/75.2b326b41.js"><link rel="prefetch" href="/assets/js/76.6d52ed9a.js"><link rel="prefetch" href="/assets/js/77.6c219b3f.js"><link rel="prefetch" href="/assets/js/78.e3a6099c.js"><link rel="prefetch" href="/assets/js/79.847c1106.js"><link rel="prefetch" href="/assets/js/8.27cd446a.js"><link rel="prefetch" href="/assets/js/80.8fda2f41.js"><link rel="prefetch" href="/assets/js/81.c64976c1.js"><link rel="prefetch" href="/assets/js/82.44648201.js"><link rel="prefetch" href="/assets/js/83.a02ab71e.js"><link rel="prefetch" href="/assets/js/84.da4c143b.js"><link rel="prefetch" href="/assets/js/85.1e5083cb.js"><link rel="prefetch" href="/assets/js/86.373e4575.js"><link rel="prefetch" href="/assets/js/87.b7dae2d7.js"><link rel="prefetch" href="/assets/js/88.40e11959.js"><link rel="prefetch" href="/assets/js/89.711c7107.js"><link rel="prefetch" href="/assets/js/9.a4f4c6a7.js"><link rel="prefetch" href="/assets/js/90.36268f74.js"><link rel="prefetch" href="/assets/js/91.0b92ab60.js"><link rel="prefetch" href="/assets/js/92.9813b046.js"><link rel="prefetch" href="/assets/js/93.fcd128dd.js"><link rel="prefetch" href="/assets/js/94.c099f487.js"><link rel="prefetch" href="/assets/js/95.8042bfa3.js"><link rel="prefetch" href="/assets/js/96.45fc745f.js"><link rel="prefetch" href="/assets/js/97.32326e64.js"><link rel="prefetch" href="/assets/js/98.82035585.js"><link rel="prefetch" href="/assets/js/99.b24b3ac3.js">
    <link rel="stylesheet" href="/assets/css/0.styles.95a28cfa.css">
  </head>
  <body class="theme-mode-light">
    <div id="app" data-server-rendered="true"><div class="theme-container sidebar-open have-rightmenu have-body-img"><header class="navbar blur"><div title="目录" class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div> <a href="/" class="home-link router-link-active"><img src="/img/EB-logo.png" alt="Keith's blog" class="logo"> <span class="site-name can-hide">Keith's blog</span></a> <div class="links"><div class="search-box"><input aria-label="Search" autocomplete="off" spellcheck="false" value=""> <!----></div> <nav class="nav-links can-hide"><div class="nav-item"><a href="/" class="nav-link">首页</a></div><div class="nav-item"><a href="/pages/294b0a/" class="nav-link">个人总结</a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="来自大佬的文章" class="dropdown-title"><!----> <span class="title" style="display:;">来自大佬的文章</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><h4>前端</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/pages/8143cc480faf9a11/" class="nav-link">前端文章</a></li><li class="dropdown-subitem"><a href="/note/javascript/" class="nav-link">学习笔记</a></li></ul></li><li class="dropdown-item"><h4>页面</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/pages/8309a5b876fc95e3/" class="nav-link">HTML</a></li><li class="dropdown-subitem"><a href="/pages/0a83b083bdf257cb/" class="nav-link">CSS</a></li></ul></li><li class="dropdown-item"><h4>技术</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/pages/9a7ee40fc232253e/" class="nav-link">技术文档</a></li><li class="dropdown-subitem"><a href="/pages/4c778760be26d8b3/" class="nav-link">GitHub技巧</a></li><li class="dropdown-subitem"><a href="/pages/117708e0af7f0bd9/" class="nav-link">Nodejs</a></li><li class="dropdown-subitem"><a href="/pages/41f87d890d0a02af/" class="nav-link">博客搭建</a></li></ul></li><li class="dropdown-item"><h4>更多</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/pages/f2a556/" class="nav-link">学习</a></li><li class="dropdown-subitem"><a href="/pages/aea6571b7a8bae86/" class="nav-link">面试</a></li><li class="dropdown-subitem"><a href="/pages/2d615df9a36a98ed/" class="nav-link">心情杂货</a></li><li class="dropdown-subitem"><a href="/pages/baaa02/" class="nav-link">实用技巧</a></li></ul></li><li class="dropdown-item"><!----> <a href="/about/" class="nav-link">关于</a></li><li class="dropdown-item"><!----> <a href="/pages/beb6c0bd8a66cea6/" class="nav-link">收藏</a></li><li class="dropdown-item"><h4>索引</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/categories/" class="nav-link">分类</a></li><li class="dropdown-subitem"><a href="/tags/" class="nav-link">标签</a></li><li class="dropdown-subitem"><a href="/archives/" class="nav-link">归档</a></li></ul></li></ul></div></div> <a href="https://github.com/yangkeith/vuepress-theme-vdoing" target="_blank" rel="noopener noreferrer" class="repo-link">
    GitHub
    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav></div></header> <div class="sidebar-mask"></div> <aside class="sidebar" style="display:none;"><div class="blogger"><img src="/img/avatar.jpg"> <div class="blogger-info"><h3>Keith</h3> <span>无名小卒</span></div></div> <nav class="nav-links"><div class="nav-item"><a href="/" class="nav-link">首页</a></div><div class="nav-item"><a href="/pages/294b0a/" class="nav-link">个人总结</a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="来自大佬的文章" class="dropdown-title"><!----> <span class="title" style="display:;">来自大佬的文章</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><h4>前端</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/pages/8143cc480faf9a11/" class="nav-link">前端文章</a></li><li class="dropdown-subitem"><a href="/note/javascript/" class="nav-link">学习笔记</a></li></ul></li><li class="dropdown-item"><h4>页面</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/pages/8309a5b876fc95e3/" class="nav-link">HTML</a></li><li class="dropdown-subitem"><a href="/pages/0a83b083bdf257cb/" class="nav-link">CSS</a></li></ul></li><li class="dropdown-item"><h4>技术</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/pages/9a7ee40fc232253e/" class="nav-link">技术文档</a></li><li class="dropdown-subitem"><a href="/pages/4c778760be26d8b3/" class="nav-link">GitHub技巧</a></li><li class="dropdown-subitem"><a href="/pages/117708e0af7f0bd9/" class="nav-link">Nodejs</a></li><li class="dropdown-subitem"><a href="/pages/41f87d890d0a02af/" class="nav-link">博客搭建</a></li></ul></li><li class="dropdown-item"><h4>更多</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/pages/f2a556/" class="nav-link">学习</a></li><li class="dropdown-subitem"><a href="/pages/aea6571b7a8bae86/" class="nav-link">面试</a></li><li class="dropdown-subitem"><a href="/pages/2d615df9a36a98ed/" class="nav-link">心情杂货</a></li><li class="dropdown-subitem"><a href="/pages/baaa02/" class="nav-link">实用技巧</a></li></ul></li><li class="dropdown-item"><!----> <a href="/about/" class="nav-link">关于</a></li><li class="dropdown-item"><!----> <a href="/pages/beb6c0bd8a66cea6/" class="nav-link">收藏</a></li><li class="dropdown-item"><h4>索引</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/categories/" class="nav-link">分类</a></li><li class="dropdown-subitem"><a href="/tags/" class="nav-link">标签</a></li><li class="dropdown-subitem"><a href="/archives/" class="nav-link">归档</a></li></ul></li></ul></div></div> <a href="https://github.com/yangkeith/vuepress-theme-vdoing" target="_blank" rel="noopener noreferrer" class="repo-link">
    GitHub
    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>初识 TypeScript</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>TypeScript 常用语法</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>ts-axios 项目初始化</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/pages/195af93fcc871b8b/" class="sidebar-link">需求分析</a></li><li><a href="/pages/6e11ac76475a2b3e/" class="sidebar-link">初始化项目</a></li><li><a href="/pages/acfe1e0b401fa984/" aria-current="page" class="active sidebar-link">编写基础请求代码</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/pages/acfe1e0b401fa984/#创建入口文件" class="sidebar-link">创建入口文件</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/pages/acfe1e0b401fa984/#编译配置文件-tsconfig-json" class="sidebar-link">编译配置文件 tsconfig.json</a></li><li class="sidebar-sub-header"><a href="/pages/acfe1e0b401fa984/#定义-axiosrequestconfig-接口类型" class="sidebar-link">定义 AxiosRequestConfig 接口类型</a></li></ul></li><li class="sidebar-sub-header"><a href="/pages/acfe1e0b401fa984/#利用-xmlhttprequest-发送请求" class="sidebar-link">利用 XMLHttpRequest 发送请求</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/pages/acfe1e0b401fa984/#引入-xhr-模块" class="sidebar-link">引入 xhr 模块</a></li></ul></li><li class="sidebar-sub-header"><a href="/pages/acfe1e0b401fa984/#demo-编写" class="sidebar-link">demo 编写</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/pages/acfe1e0b401fa984/#依赖安装" class="sidebar-link">依赖安装</a></li><li class="sidebar-sub-header"><a href="/pages/acfe1e0b401fa984/#编写-webpack-配置文件" class="sidebar-link">编写 webpack 配置文件</a></li><li class="sidebar-sub-header"><a href="/pages/acfe1e0b401fa984/#编写-server-文件" class="sidebar-link">编写 server 文件</a></li><li class="sidebar-sub-header"><a href="/pages/acfe1e0b401fa984/#编写-demo-代码" class="sidebar-link">编写 demo 代码</a></li><li class="sidebar-sub-header"><a href="/pages/acfe1e0b401fa984/#运行-demo" class="sidebar-link">运行 demo</a></li></ul></li></ul></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 基础功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 异常情况处理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 接口扩展</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 拦截器实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 配置化实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 取消功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 更多功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 单元测试</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 部署与发布</span> <span class="arrow right"></span></p> <!----></section></li></ul> <div class="sidebar-slot sidebar-slot-bottom"><!-- 正方形 -->
      <ins class="adsbygoogle"
          style="display:block"
          data-ad-client="ca-pub-7828333725993554"
          data-ad-slot="3508773082"
          data-ad-format="auto"
          data-full-width-responsive="true"></ins>
      <script>
          (adsbygoogle = window.adsbygoogle || []).push({});
      </script></div></aside> <div><main class="page"><div class="theme-vdoing-wrapper "><div class="articleInfo-wrap" data-v-70a2d273><div class="articleInfo" data-v-70a2d273><ul class="breadcrumbs" data-v-70a2d273><li data-v-70a2d273><a href="/" title="首页" class="iconfont icon-home router-link-active" data-v-70a2d273></a></li> <li data-v-70a2d273><a href="/note/typescript-axios" title="《TypeScript 从零实现 axios》-目录页" data-v-70a2d273>《TypeScript 从零实现 axios》</a></li> <li data-v-70a2d273><a href="/note/typescript-axios/#ts-axios 项目初始化" title="《TypeScript 从零实现 axios》#ts-axios 项目初始化" data-v-70a2d273>ts-axios 项目初始化</a></li> <!----></ul> <div class="info" data-v-70a2d273><div title="作者" class="author iconfont icon-touxiang" data-v-70a2d273><a href="javascript:;" data-v-70a2d273>HuangYi</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-70a2d273><a href="javascript:;" data-v-70a2d273>2020-01-05</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-content"></div></div></div> <h1><img src="">
          编写基础请求代码
        </h1> <div class="page-slot page-slot-top"><!-- 固定100% * 90px可显示，max-height:90px未见显示-->
     <ins class="adsbygoogle"
          style="display:inline-block;width:100%;max-height:90px"
          data-ad-client="ca-pub-7828333725993554"
          data-ad-slot="6625304284"></ins>
      <script>
          (adsbygoogle = window.adsbygoogle || []).push({});
      </script></div> <div class="theme-vdoing-content content__default"><h1 id="编写基础请求代码"><a href="#编写基础请求代码" class="header-anchor">#</a> 编写基础请求代码</h1> <p>我们这节课开始编写 <code>ts-axios</code> 库，我们的目标是实现简单的发送请求功能，即客户端通过 <code>XMLHttpRequest</code> 对象把请求发送到 server 端，server 端能收到请求并响应即可。</p> <p>我们实现 <code>axios</code> 最基本的操作，通过传入一个对象发送请求，如下：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token function">axios</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  method<span class="token operator">:</span> <span class="token string">'get'</span><span class="token punctuation">,</span>
  url<span class="token operator">:</span> <span class="token string">'/simple/get'</span><span class="token punctuation">,</span>
  params<span class="token operator">:</span> <span class="token punctuation">{</span>
    a<span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
    b<span class="token operator">:</span> <span class="token number">2</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><h2 id="创建入口文件"><a href="#创建入口文件" class="header-anchor">#</a> 创建入口文件</h2> <p>我们删除 <code>src</code> 目录下的文件，先创建一个 <code>index.ts</code> 文件，作为整个库的入口文件，然后我们先定义一个 <code>axios</code> 方法，并把它导出，如下：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code>
<span class="token keyword">function</span> <span class="token function">axios</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span> <span class="token punctuation">{</span>

<span class="token punctuation">}</span>

<span class="token keyword">export</span> <span class="token keyword">default</span> axios

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><p>这里 TypeScript 编译器会检查到错误，分别是 <code>config</code> 的声明上有隐含的 <code>any</code> 报错，以及代码块为空。代码块为空我们比较好理解，第一个错误的原因是因为我们给 TypeScript 编译配置的 <code>strict</code> 设置为 <code>true</code> 导致。</p> <h3 id="编译配置文件-tsconfig-json"><a href="#编译配置文件-tsconfig-json" class="header-anchor">#</a> 编译配置文件 tsconfig.json</h3> <p><code>tsconfig.json</code> 文件中指定了用来编译这个项目的根文件和编译选项，关于它的具体学习，我希望同学们去<a href="https://www.typescriptlang.org/docs/handbook/tsconfig-json.html" target="_blank" rel="noopener noreferrer">官网<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a>系统学习一下</p> <p>我们在之前讲 TypeScript 的基础时，会运行 <code>tsc</code> 命令去编译 TypeScript 文件，编译器会从当前目录开始去查找 <code>tsconfig.json</code> 文件，作为编译时的一些编译选项。</p> <p>我们来看一下 tsconfig.json 文件，它包含了很多编译时的配置，其中我们把 <code>strict</code> 设置为 <code>true</code>，它相当于启用所有严格类型的检查选项。启用 <code>--strict</code> 相当于启用 <code>--noImplicitAny</code>,<code>--noImplicitThis</code>,<code>--alwaysStrict</code>，<code>--strictNullChecks</code> 和 <code>--strictFunctionTypes</code> 和 <code>--strictPropertyInitialization</code>。</p> <p>我们讲 TypeScript 的基础时提到了 <code>--strictNullChecks</code>，其它的编译配置我建议同学们都去查看它的<a href="https://www.typescriptlang.org/docs/handbook/compiler-options.html" target="_blank" rel="noopener noreferrer">官网文档<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a>，把它当做手册去查阅即可。</p> <h3 id="定义-axiosrequestconfig-接口类型"><a href="#定义-axiosrequestconfig-接口类型" class="header-anchor">#</a> 定义 AxiosRequestConfig 接口类型</h3> <p>接下来，我们需要给 <code>config</code> 参数定义一种接口类型。我们创建一个 <code>types</code> 目录，在下面创建一个 <code>index.ts</code> 文件，作为我们项目中公用的类型定义文件。</p> <p>接下来我们来定义 <code>AxiosRequestConfig</code> 接口类型：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">AxiosRequestConfig</span> <span class="token punctuation">{</span>
  url<span class="token operator">:</span> <span class="token builtin">string</span>
  method<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">string</span>
  data<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">any</span>
  params<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">any</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><p>其中，<code>url</code> 为请求的地址，必选属性；而其余属性都是可选属性。<code>method</code> 是请求的 HTTP 方法；<code>data</code> 是 <code>post</code>、<code>patch</code> 等类型请求的数据，放到 <code>request body</code> 中的；<code>params</code> 是 <code>get</code>、<code>head</code> 等类型请求的数据，拼接到 <code>url</code> 的 <code>query string</code> 中的。</p> <p>为了让 <code>method</code> 只能传入合法的字符串，我们定义一种字符串字面量类型 <code>Method</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">type</span> <span class="token class-name">Method</span> <span class="token operator">=</span> <span class="token string">'get'</span> <span class="token operator">|</span> <span class="token string">'GET'</span>
  <span class="token operator">|</span> <span class="token string">'delete'</span> <span class="token operator">|</span> <span class="token string">'Delete'</span>
  <span class="token operator">|</span> <span class="token string">'head'</span> <span class="token operator">|</span> <span class="token string">'HEAD'</span>
  <span class="token operator">|</span> <span class="token string">'options'</span> <span class="token operator">|</span> <span class="token string">'OPTIONS'</span>
  <span class="token operator">|</span> <span class="token string">'post'</span> <span class="token operator">|</span> <span class="token string">'POST'</span>
  <span class="token operator">|</span> <span class="token string">'put'</span> <span class="token operator">|</span> <span class="token string">'PUT'</span>
  <span class="token operator">|</span> <span class="token string">'patch'</span> <span class="token operator">|</span> <span class="token string">'PATCH'</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><p>接着我们把 <code>AxiosRequestConfig</code> 中的 <code>method</code> 属性类型改成这种字符串字面量类型：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">AxiosRequestConfig</span> <span class="token punctuation">{</span>
  url<span class="token operator">:</span> <span class="token builtin">string</span>
  method<span class="token operator">?</span><span class="token operator">:</span> Method
  data<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">any</span>
  params<span class="token operator">?</span><span class="token operator">:</span> <span class="token builtin">any</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><p>然后回到 <code>index.ts</code>，我们引入 <code>AxiosRequestConfig</code> 类型，作为 <code>config</code> 的参数类型，如下：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> AxiosRequestConfig <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./types'</span>

<span class="token keyword">function</span> <span class="token function">axios</span><span class="token punctuation">(</span>config<span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token punctuation">}</span>

<span class="token keyword">export</span> <span class="token keyword">default</span> axios
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><p>那么接下来，我们就来实现这个函数体内部的逻辑——发送请求。</p> <h2 id="利用-xmlhttprequest-发送请求"><a href="#利用-xmlhttprequest-发送请求" class="header-anchor">#</a> 利用 XMLHttpRequest 发送请求</h2> <p>我们并不想在 <code>index.ts</code> 中去实现发送请求的逻辑，我们利用模块化的编程思想，把这个功能拆分到一个单独的模块中。</p> <p>于是我们在 <code>src</code> 目录下创建一个 <code>xhr.ts</code> 文件，我们导出一个 <code>xhr</code> 方法，它接受一个 <code>config</code> 参数，类型也是 <code>AxiosRequestConfig</code> 类型。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> AxiosRequestConfig <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./types'</span>

<span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">function</span> <span class="token function">xhr</span><span class="token punctuation">(</span>config<span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>接下来，我们来实现这个函数体逻辑，如下：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">function</span> <span class="token function">xhr</span><span class="token punctuation">(</span>config<span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> <span class="token punctuation">{</span> data <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">,</span> url<span class="token punctuation">,</span> method <span class="token operator">=</span> <span class="token string">'get'</span> <span class="token punctuation">}</span> <span class="token operator">=</span> config

  <span class="token keyword">const</span> request <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLHttpRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

  request<span class="token punctuation">.</span><span class="token function">open</span><span class="token punctuation">(</span>method<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> url<span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">)</span>

  request<span class="token punctuation">.</span><span class="token function">send</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>我们首先通过解构赋值的语法从 <code>config</code> 中拿到对应的属性值赋值给我的变量，并且还定义了一些默认值，因为在 <code>AxiosRequestConfig</code> 接口的定义中，有些属性是可选的。</p> <p>接着我们实例化了一个 <code>XMLHttpRequest</code> 对象，然后调用了它的 <code>open</code> 方法，传入了对应的一些参数，最后调用 <code>send</code> 方法发送请求。</p> <p>对于 <code>XMLHttpRequest</code> 的学习，我希望同学们去 <a href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest" target="_blank" rel="noopener noreferrer">mdn<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> 上系统地学习一下它的一些属性和方法，当做参考资料，因为在后续的开发中我们可能会反复查阅这些文档资料。</p> <h3 id="引入-xhr-模块"><a href="#引入-xhr-模块" class="header-anchor">#</a> 引入 xhr 模块</h3> <p>编写好了 <code>xhr</code> 模块，我们就需要在 <code>index.ts</code> 中去引入这个模块，如下：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> AxiosRequestConfig <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./types'</span>
<span class="token keyword">import</span> xhr <span class="token keyword">from</span> <span class="token string">'./xhr'</span>

<span class="token keyword">function</span> <span class="token function">axios</span><span class="token punctuation">(</span>config<span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span> <span class="token punctuation">{</span>
  <span class="token function">xhr</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span>
<span class="token punctuation">}</span>

<span class="token keyword">export</span> <span class="token keyword">default</span> axios
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><p>那么至此，我们基本的发送请求代码就编写完毕了，接下来我们来写一个小 demo，来使用我们编写的 axios 库去发送请求。</p> <h2 id="demo-编写"><a href="#demo-编写" class="header-anchor">#</a> demo 编写</h2> <p>我们会利用 Node.js 的 <a href="http://expressjs.com/" target="_blank" rel="noopener noreferrer"><code>express</code><span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> 库去运行我们的 demo，利用 <a href="https://webpack.js.org/" target="_blank" rel="noopener noreferrer"><code>webpack</code><span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> 来作为 demo 的构建工具。</p> <h3 id="依赖安装"><a href="#依赖安装" class="header-anchor">#</a> 依赖安装</h3> <p>我们先来安装一些编写 demo 需要的依赖包，如下：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>&quot;webpack&quot;: &quot;^4.28.4&quot;,
&quot;webpack-dev-middleware&quot;: &quot;^3.5.0&quot;,
&quot;webpack-hot-middleware&quot;: &quot;^2.24.3&quot;,
&quot;ts-loader&quot;: &quot;^5.3.3&quot;,
&quot;tslint-loader&quot;: &quot;^3.5.4&quot;,
&quot;express&quot;: &quot;^4.16.4&quot;,
&quot;body-parser&quot;: &quot;^1.18.3&quot;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><p>其中，<code>webpack</code> 是打包构建工具，<code>webpack-dev-middleware</code> 和 <code>webpack-hot-middleware</code> 是 2 个 <code>express</code> 的 <code>webpack</code> 中间件，<code>ts-loader</code> 和 <code>tslint-loader</code> 是 <code>webpack</code> 需要的 TypeScript 相关 loader，<code>express</code> 是 Node.js 的服务端框架，<code>body-parser</code> 是 <code>express</code> 的一个中间件，解析 <code>body</code> 数据用的。</p> <h3 id="编写-webpack-配置文件"><a href="#编写-webpack-配置文件" class="header-anchor">#</a> 编写 webpack 配置文件</h3> <p>在 <code>examples</code> 目录下创建 <code>webpack</code> 配置文件 <code>webpack.config.js</code>：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> fs <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'fs'</span><span class="token punctuation">)</span>
<span class="token keyword">const</span> path <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'path'</span><span class="token punctuation">)</span>
<span class="token keyword">const</span> webpack <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'webpack'</span><span class="token punctuation">)</span>

module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
  mode<span class="token operator">:</span> <span class="token string">'development'</span><span class="token punctuation">,</span>

  <span class="token comment">/**
   * 我们会在 examples 目录下建多个子目录
   * 我们会把不同章节的 demo 放到不同的子目录中
   * 每个子目录的下会创建一个 app.ts
   * app.ts 作为 webpack 构建的入口文件
   * entries 收集了多目录个入口文件，并且每个入口还引入了一个用于热更新的文件
   * entries 是一个对象，key 为目录名
   */</span>
  entry<span class="token operator">:</span> fs<span class="token punctuation">.</span><span class="token function">readdirSync</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">reduce</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">entries<span class="token punctuation">,</span> dir</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> fullDir <span class="token operator">=</span> path<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> dir<span class="token punctuation">)</span>
    <span class="token keyword">const</span> entry <span class="token operator">=</span> path<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span>fullDir<span class="token punctuation">,</span> <span class="token string">'app.ts'</span><span class="token punctuation">)</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>fs<span class="token punctuation">.</span><span class="token function">statSync</span><span class="token punctuation">(</span>fullDir<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isDirectory</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> fs<span class="token punctuation">.</span><span class="token function">existsSync</span><span class="token punctuation">(</span>entry<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      entries<span class="token punctuation">[</span>dir<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">'webpack-hot-middleware/client'</span><span class="token punctuation">,</span> entry<span class="token punctuation">]</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">return</span> entries
  <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>

  <span class="token comment">/**
   * 根据不同的目录名称，打包生成目标 js，名称和目录名一致
   */</span>
  output<span class="token operator">:</span> <span class="token punctuation">{</span>
    path<span class="token operator">:</span> path<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'__build__'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    filename<span class="token operator">:</span> <span class="token string">'[name].js'</span><span class="token punctuation">,</span>
    publicPath<span class="token operator">:</span> <span class="token string">'/__build__/'</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>

  module<span class="token operator">:</span> <span class="token punctuation">{</span>
    rules<span class="token operator">:</span> <span class="token punctuation">[</span>
      <span class="token punctuation">{</span>
        test<span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.ts$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
        enforce<span class="token operator">:</span> <span class="token string">'pre'</span><span class="token punctuation">,</span>
        use<span class="token operator">:</span> <span class="token punctuation">[</span>
          <span class="token punctuation">{</span>
            loader<span class="token operator">:</span> <span class="token string">'tslint-loader'</span>
          <span class="token punctuation">}</span>
        <span class="token punctuation">]</span>
      <span class="token punctuation">}</span><span class="token punctuation">,</span>
      <span class="token punctuation">{</span>
        test<span class="token operator">:</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\.tsx?$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span>
        use<span class="token operator">:</span> <span class="token punctuation">[</span>
          <span class="token punctuation">{</span>
            loader<span class="token operator">:</span> <span class="token string">'ts-loader'</span><span class="token punctuation">,</span>
            options<span class="token operator">:</span> <span class="token punctuation">{</span>
              transpileOnly<span class="token operator">:</span> <span class="token boolean">true</span>
            <span class="token punctuation">}</span>
          <span class="token punctuation">}</span>
        <span class="token punctuation">]</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">]</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>

  resolve<span class="token operator">:</span> <span class="token punctuation">{</span>
    extensions<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'.ts'</span><span class="token punctuation">,</span> <span class="token string">'.tsx'</span><span class="token punctuation">,</span> <span class="token string">'.js'</span><span class="token punctuation">]</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>

  plugins<span class="token operator">:</span> <span class="token punctuation">[</span>
    <span class="token keyword">new</span> <span class="token class-name">webpack<span class="token punctuation">.</span>HotModuleReplacementPlugin</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token keyword">new</span> <span class="token class-name">webpack<span class="token punctuation">.</span>NoEmitOnErrorsPlugin</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token punctuation">]</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br></div></div><h3 id="编写-server-文件"><a href="#编写-server-文件" class="header-anchor">#</a> 编写 server 文件</h3> <p>在 <code>examples</code> 目录下创建 <code>server.js</code> 文件：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> express <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'express'</span><span class="token punctuation">)</span>
<span class="token keyword">const</span> bodyParser <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'body-parser'</span><span class="token punctuation">)</span>
<span class="token keyword">const</span> webpack <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'webpack'</span><span class="token punctuation">)</span>
<span class="token keyword">const</span> webpackDevMiddleware <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'webpack-dev-middleware'</span><span class="token punctuation">)</span>
<span class="token keyword">const</span> webpackHotMiddleware <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'webpack-hot-middleware'</span><span class="token punctuation">)</span>
<span class="token keyword">const</span> WebpackConfig <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'./webpack.config'</span><span class="token punctuation">)</span>

<span class="token keyword">const</span> app <span class="token operator">=</span> <span class="token function">express</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token keyword">const</span> compiler <span class="token operator">=</span> <span class="token function">webpack</span><span class="token punctuation">(</span>WebpackConfig<span class="token punctuation">)</span>

app<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span><span class="token function">webpackDevMiddleware</span><span class="token punctuation">(</span>compiler<span class="token punctuation">,</span> <span class="token punctuation">{</span>
  publicPath<span class="token operator">:</span> <span class="token string">'/__build__/'</span><span class="token punctuation">,</span>
  stats<span class="token operator">:</span> <span class="token punctuation">{</span>
    colors<span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
    chunks<span class="token operator">:</span> <span class="token boolean">false</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span>

app<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span><span class="token function">webpackHotMiddleware</span><span class="token punctuation">(</span>compiler<span class="token punctuation">)</span><span class="token punctuation">)</span>

app<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>express<span class="token punctuation">.</span><span class="token function">static</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">)</span><span class="token punctuation">)</span>

app<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>bodyParser<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
app<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>bodyParser<span class="token punctuation">.</span><span class="token function">urlencoded</span><span class="token punctuation">(</span><span class="token punctuation">{</span> extended<span class="token operator">:</span> <span class="token boolean">true</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span>

<span class="token keyword">const</span> port <span class="token operator">=</span> process<span class="token punctuation">.</span>env<span class="token punctuation">.</span><span class="token constant">PORT</span> <span class="token operator">||</span> <span class="token number">8080</span>
module<span class="token punctuation">.</span>exports <span class="token operator">=</span> app<span class="token punctuation">.</span><span class="token function">listen</span><span class="token punctuation">(</span>port<span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Server listening on http://localhost:</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>port<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">, Ctrl+C to stop</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br></div></div><h3 id="编写-demo-代码"><a href="#编写-demo-代码" class="header-anchor">#</a> 编写 demo 代码</h3> <p>首先在 <code>examples</code> 目录下创建 <code>index.html</code> 和 <code>global.css</code>，作为所有 <code>demo</code> 的入口文件已全局样式文件。</p> <p><code>index.html</code>：</p> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>en<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>utf-8<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>ts-axios examples<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>link</span> <span class="token attr-name">rel</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>stylesheet<span class="token punctuation">&quot;</span></span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>/global.css<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span> <span class="token special-attr"><span class="token attr-name">style</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span><span class="token value css language-css"><span class="token property">padding</span><span class="token punctuation">:</span> 0 20px</span><span class="token punctuation">&quot;</span></span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h1</span><span class="token punctuation">&gt;</span></span>ts-axios examples<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h1</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>ul</span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>simple<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>Simple<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>ul</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br></div></div><p><code>global.css</code>：</p> <div class="language-css line-numbers-mode"><pre class="language-css"><code><span class="token selector">html, body</span> <span class="token punctuation">{</span>
  <span class="token property">font-family</span><span class="token punctuation">:</span> -apple-system<span class="token punctuation">,</span> BlinkMacSystemFont<span class="token punctuation">,</span> <span class="token string">&quot;Segoe UI&quot;</span><span class="token punctuation">,</span> Roboto<span class="token punctuation">,</span> Helvetica<span class="token punctuation">,</span> Arial<span class="token punctuation">,</span> sans-serif<span class="token punctuation">,</span> <span class="token string">&quot;Apple Color Emoji&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;Segoe UI Emoji&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;Segoe UI Symbol&quot;</span><span class="token punctuation">;</span>
  <span class="token property">color</span><span class="token punctuation">:</span> #2c3e50<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token selector">ul</span> <span class="token punctuation">{</span>
  <span class="token property">line-height</span><span class="token punctuation">:</span> 1.5em<span class="token punctuation">;</span>
  <span class="token property">padding-left</span><span class="token punctuation">:</span> 1.5em<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token selector">a</span> <span class="token punctuation">{</span>
  <span class="token property">color</span><span class="token punctuation">:</span> #7f8c8d<span class="token punctuation">;</span>
  <span class="token property">text-decoration</span><span class="token punctuation">:</span> none<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token selector">a:hover</span> <span class="token punctuation">{</span>
  <span class="token property">color</span><span class="token punctuation">:</span> #4fc08d<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br></div></div><p>然后在 <code>examples</code> 目录下创建 <code>simple</code> 目录，作为本章节的 demo 目录，在该目录下再创建 <code>index.html</code> 和 <code>app.ts</code> 文件</p> <p><code>index.html</code> 文件如下:</p> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>en<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>utf-8<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>Simple example<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>/__build__/simple.js<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token script"></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p><code>app.ts</code> 文件如下：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> axios <span class="token keyword">from</span> <span class="token string">'../../src/index'</span>

<span class="token function">axios</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  method<span class="token operator">:</span> <span class="token string">'get'</span><span class="token punctuation">,</span>
  url<span class="token operator">:</span> <span class="token string">'/simple/get'</span><span class="token punctuation">,</span>
  params<span class="token operator">:</span> <span class="token punctuation">{</span>
    a<span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
    b<span class="token operator">:</span> <span class="token number">2</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p>因为我们这里通过 <code>axios</code> 发送了请求，那么我们的 server 端要实现对应的路由接口，我们来修改 <code>server.js</code>，添加如下代码：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> router <span class="token operator">=</span> express<span class="token punctuation">.</span><span class="token function">Router</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

router<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'/simple/get'</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">req<span class="token punctuation">,</span> res</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  res<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    msg<span class="token operator">:</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">hello world</span><span class="token template-punctuation string">`</span></span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

app<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>router<span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><h3 id="运行-demo"><a href="#运行-demo" class="header-anchor">#</a> 运行 demo</h3> <p>接着我们在 <code>package.json</code> 中去新增一个 <code>npm script</code>：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>&quot;dev&quot;: &quot;node examples/server.js&quot;
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>然后我们去控制台执行命令</p> <div class="language-bash line-numbers-mode"><pre class="language-bash"><code><span class="token function">npm</span> run dev
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>相当于执行了 <code>node examples/server.js</code>，会开启我们的 server。</p> <p>接着我们打开 chrome 浏览器，访问 <code>http://localhost:8080/</code> 即可访问我们的 demo 了，我们点到 <code>Simple</code> 目录下，通过开发者工具的 network 部分我们可以看到成功发送到了一条请求，并在 response 中看到了服务端返回的数据。</p> <p>至此，我们就实现了一个简单的请求发送，并编写了相关的 demo。但是现在存在一些问题：我们传入的 <code>params</code> 数据并没有用，也没有拼接到 <code>url</code> 上；我们对 request body 的数据格式、请求头 headers 也没有做处理；另外我们虽然从网络层面收到了响应的数据，但是我们代码层面也并没有对响应的数据做处理。那么下面一章，我们就来解决这些问题。</p></div></div> <div class="page-slot page-slot-bottom"><!-- 横向自适应 -->
      <ins class="adsbygoogle"
          style="display:block"
          data-ad-client="ca-pub-7828333725993554"
          data-ad-slot="6620245489"
          data-ad-format="auto"
          data-full-width-responsive="true"></ins>
      <script>
          (adsbygoogle = window.adsbygoogle || []).push({});
      </script></div> <div class="page-edit"><!----> <div class="tags"><a href="/tags/?tag=TypeScript" title="标签">#TypeScript</a></div> <!----></div> <div class="page-nav-wapper"><div class="page-nav-centre-wrap"><a href="/pages/6e11ac76475a2b3e/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">初始化项目</div></a> <a href="/pages/1313dae575f6dddf/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">处理请求 url 参数</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
        ←
        <a href="/pages/6e11ac76475a2b3e/" class="prev">初始化项目</a></span> <span class="next"><a href="/pages/1313dae575f6dddf/">处理请求 url 参数</a>→
      </span></p></div></div></div> <div class="article-list"><div class="article-title"><a href="/archives/" class="iconfont icon-bi">最近更新</a></div> <div class="article-wrapper"><dl><dd>01</dd> <dt><a href="/pages/dcedab/"><div>Nginx配置https转http</div></a> <span>12-10</span></dt></dl><dl><dd>02</dd> <dt><a href="/pages/82baa3/"><div>使用State Hook</div></a> <span>04-06</span></dt></dl><dl><dd>03</dd> <dt><a href="/pages/72710d/"><div>使用Effect Hook</div></a> <span>04-06</span></dt></dl> <dl><dd></dd> <dt><a href="/archives/" class="more">更多文章&gt;</a></dt></dl></div></div></main></div> <div class="footer"><!----> 
  Theme by
  <a href="https://github.com/xugaoyi/vuepress-theme-vdoing" target="_blank" title="本站主题">Vdoing</a> 
    | Copyright © 2021-2022
    <span><div style="width:300px;margin:0 auto; padding:20px 0;"><a target="_blank" href="http://www.beian.gov.cn/portal/registerSystemInfo?recordcode=13019902000398" style="display:inline-block;text-decoration:none;height:20px;line-height:20px;"><img src="" style="float:left;"/><p style="float:left;height:20px;line-height:20px;margin: 0px 0px 0px 5px; color:#939393;">冀公网安备 13019902000398号</p></a></div></span></div> <div class="buttons"><div title="返回顶部" class="button blur go-to-top iconfont icon-fanhuidingbu" style="display:none;"></div> <div title="去评论" class="button blur go-to-comment iconfont icon-pinglun" style="display:none;"></div> <div title="主题模式" class="button blur theme-mode-but iconfont icon-zhuti"><ul class="select-box" style="display:none;"><li class="iconfont icon-zidong">
          跟随系统
        </li><li class="iconfont icon-rijianmoshi">
          浅色模式
        </li><li class="iconfont icon-yejianmoshi">
          深色模式
        </li><li class="iconfont icon-yuedu">
          阅读模式
        </li></ul></div></div> <div class="body-bg" style="background:url() center center / cover no-repeat;opacity:0.5;"></div> <!----> <div class="custom-html-window custom-html-window-rb" style="display:;"><div class="custom-wrapper"><i class="close-but">×</i> <div><!-- 固定160*160px -->
      <ins class="adsbygoogle"
          style="display:inline-block;max-width:160px;max-height:160px"
          data-ad-client="ca-pub-7828333725993554"
          data-ad-slot="8377369658"></ins>
      <script>
          (adsbygoogle = window.adsbygoogle || []).push({});
      </script>
      </div></div></div></div><div class="global-ui"></div></div>
    <script src="/assets/js/app.ae5bf724.js" defer></script><script src="/assets/js/2.72b09a26.js" defer></script><script src="/assets/js/3.96877024.js" defer></script><script src="/assets/js/170.d93daf1f.js" defer></script>
  </body>
</html>